01 March 2008

This 12V or 24V high-current DC Motor Speed Controller is rated at up to 40A (continuous) and is suitable for heavy-duty motor applications. All control tasks are monitored by a microcontroller and as a result, the list of features is extensive.

01 March 2008

This DDS VFO uses a widely available recycled Nokia cellular phone LCD to display analog and digital frequency readouts, text, and VFO status messages

01 February 2008

Interesting circuit ideas which we have checked but not built and tested. Contributions from readers are welcome and will be paid for at standard rates.

01 February 2008

The Toyota Prius has been the most successful and popular hybrid car produced so far but it has one weakness - it cannot go very far on battery power alone. This article tells how a large Lithium-ion battery was added to a Prius, giving it the ability to drive much further on battery power, thereby greatly increasing fuel economy.

01 February 2008

Designed to control the UHF Remote Mains Switch, this hand-held transmitter can operate over a 200m range. It's based on a PIC micro and a pre-assembled transmitter module, making it easy to build and get going.

01 February 2008

Want to switch mains appliances on and off remotely? This UHF Remote Mains Switch can do it for you. It's operated using a hand-held UHF transmitter or you can team it with the Water Tank Level Meter Base Station described last month to automatically control mains-operated water pumps. An in-built timer also enables the unit to turn off automatically after a preset period.

01 February 2008

If you drive your car for optimum performance, you will want this Shift Light Indicator to indicate just when to change gears. As a bonus, it incorporates a Rev Limiter which throttles back the fuel injectors.

01 February 2008

The ADS7062CA Digital Storage Oscilloscope from ATTEN incorporates many features found only in dearer oscilloscopes. It represents very good value for money and its bandwidth is high enough for most applications, including video.

01 February 2008

In this second part of our mini-series, Clive Seager talks us through using the new PICAXE VSM simulation software.

01 January 2008

Now that DVD players are being made in the squillions and are very cheap, there are few hifi manufacturers actually making CD players. Denon is one of the few makers and their products are highly prized. The Denon DCD-700AE CD player is a high quality machine which provides the bonus of pitch control and being able to play MP3 disks.